Physiology Lab Fall 2006 Stark Quiz 2

1. Which type of junction transmits electricity between cardiac muscle cells?

Gap Junctions

2. What are the 3 hormones that affect levels of Ca+2 in vivo?

Calcitonin, Vitamin D, and PTH

3. In the absence of ATP, give the state of myosin in relation to actin.

Myosin is bound to actin.

4. The M line of a connection point for which protein?

Myosin

5. The isotropic and anisotropic bands get there name by the way they react with __________.

Light

6. What type of signal do T-tubules bring down into the muscle cell?

Action potential/Electrical

7. Name the two structures associated with the release and concentration of Ca+2 ions.

Sarcoplasmic Reticulum and the Terminal cisternae

8. Which type of muscle lacks striations?

Smooth Muscle

9. What were the two main variables being measured in lab last week?

Force and EMG

10. Which protein blocks the actin binding site?

Tropomyosin

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